Rock Identifier

Category

Sedimentary (Secondary Mineral Formation)

Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.

Ferruginous Sandstone (Ironstone) (Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))) — sedimentary

Ferruginous Sandstone (Ironstone)

Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))

Banded Chert (Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Cryptocrystalline Quartz (SiO2)

Red Jasper (beads) (Silicon Dioxide (SiO2) with iron inclusions) — Sedimentary Rock

Red Jasper (beads)

Silicon Dioxide (SiO2) with iron inclusions

Sedimentary Rock

Greenstone with Quartz Veining (Epidiorite or Metabasalt with SiO2 (Quartz) veins) — metamorphic

Greenstone with Quartz Veining

Epidiorite or Metabasalt with SiO2 (Quartz) veins

Brown Jasper (Jasper (a cryptocrystalline variety of Quartz, SiO2)) — Mineral, specifically a variety of Quartz

Brown Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO2)

Mineral, specifically a variety of Quartz

Carnelian Agate (Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions

Moonstone (Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group) — Mineral

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group

Pyrite Sun (Pyrite Dollar) (Iron Disulfide (FeS2)) — mineral

Pyrite Sun (Pyrite Dollar)

Iron Disulfide (FeS2)

Banded Gneiss (Gneiss (pronounced "nice")) — Metamorphic Rock

Banded Gneiss

Gneiss (pronounced "nice")

Metamorphic Rock

Granite with Orthoclase and Hematite Staining (Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)) — igneous

Granite with Orthoclase and Hematite Staining

Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Chert (Lightly weathered variety) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Lightly weathered variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Red Jasper (Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)) — sedimentary

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Basalt Pebble with Quartz Veining (Basalt (extrusive volcanic rock)) — igneous

Basalt Pebble with Quartz Veining

Basalt (extrusive volcanic rock)

Quartz (Quartz (SiO₂ - Silicon Dioxide)) — mineral

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Botryoidal Hematite (Kidney Ore) (Iron(III) oxide (Fe2O3)) — Mineral

Botryoidal Hematite (Kidney Ore)

Iron(III) oxide (Fe2O3)

Copper Ore (with Malachite and Azurite) (Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)) — mineral

Copper Ore (with Malachite and Azurite)

Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)

Amethyst (Silicon dioxide (SiO2) containing traces of iron and manganese) — mineral

Amethyst

Silicon dioxide (SiO2) containing traces of iron and manganese

Prehnite (Prehnite - Ca2Al(AlSi3O10)(OH)2) — mineral

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Red Quartz (Ferruginous Quartz) (Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)) — mineral

Red Quartz (Ferruginous Quartz)

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Pink Sapphire (Corundum (Al2O3 with trace Chromium and Iron)) — mineral

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining) (Quartz (SiO₂)) — Mineral

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)

Quartz (SiO₂)

Rock Salt / Halite Crust (Halite (Sodium Chloride, NaCl)) — sedimentary

Rock Salt / Halite Crust

Halite (Sodium Chloride, NaCl)

Red Jasper (Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Iron Slag (Anthropogenic Vitreous Silicate (Byproduct of Smelting)) — Mineral-like byproduct

Iron Slag

Anthropogenic Vitreous Silicate (Byproduct of Smelting)

Mineral-like byproduct

Blue Sapphire (Corundum (Al2O3) with traces of Iron and Titanium) — mineral

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Amazonite (Amazonite / Microcline (KAlSi3O8)) — igneous

Amazonite

Amazonite / Microcline (KAlSi3O8)

Amethyst and Citrine (Ametrine Mix) (Silicon Dioxide (SiO2) with Fe3+ impurities) — mineral

Amethyst and Citrine (Ametrine Mix)

Silicon Dioxide (SiO2) with Fe3+ impurities

Orthoclase Feldspar (Salmon variety) (Orthoclase, KAlSi3O8) — mineral

Orthoclase Feldspar (Salmon variety)

Orthoclase, KAlSi3O8

Rhodonite (Rhodonite (MnSiO3)) — mineral

Rhodonite

Rhodonite (MnSiO3)

Magnetite (potentially as a Lodestone or within Ironstone) (Magnetite (Fe3O4)) — mineral

Magnetite (potentially as a Lodestone or within Ironstone)

Magnetite (Fe3O4)

Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Amethyst (SiO2 (Silicon Dioxide) - Purple variety of Quartz) — mineral

Amethyst

SiO2 (Silicon Dioxide) - Purple variety of Quartz

Amethyst (SiO2 (Amethyst is a variety of Quartz)) — mineral

Amethyst

SiO2 (Amethyst is a variety of Quartz)

Chert (varieties include Flint and Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Anthracite Coal (Coal (predominantly carbon)) — sedimentary

Anthracite Coal

Coal (predominantly carbon)

Chert (or possibly Flint) (Chert (variant: Flint)) — Sedimentary

Chert (or possibly Flint)

Chert (variant: Flint)

Banded Chert (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Greywacke (Greywacke (Lithofeldspathic Sandstone)) — sedimentary

Greywacke

Greywacke (Lithofeldspathic Sandstone)

River Stone (River Pebbles) (Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)) — sedimentary

River Stone (River Pebbles)

Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)

Chert (variations include Flint/Novaculite) (Chert (formula: SiO2)) — sedimentary

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)